Here's how to calculate the moles of solute in a solution:

Understanding Molarity

Molarity (M) is a unit of concentration that represents moles of solute per liter of solution.

Calculation

1. Given:

* Volume of solution (V) = 12.0 L

* Molarity of solution (M) = 3.00 M

2. Formula:

Moles of solute (n) = Molarity (M) * Volume of solution (V)

3. Substitute values:

n = 3.00 M * 12.0 L

4. Calculate:

n = 36.0 moles

Answer: There are 36.0 moles of HCl present in 12.0 L of 3.00 M HCl solution.